In this News, we present another FSI simulation performed using
ADINA in the car industry. This time, the component simulated is the
hydromount shown in Figure 1 below. The objective of the simulation
was to evaluate the stiffness of the hydromount at different operating
frequencies. The rubber part of the hydromount experiences large
deformations and contact with the metal mounts and the plate. The fluid
is viscous incompressible and described by the Arbitrary Lagrangian-Eulerian
formulation. The direct monolithic solver is used in ADINA for
this FSI solution due to the strong coupling between the solid and the
fluid.

Figure 1 Hydromount

The hydromount was first subjected to a static pre-load, followed by different transient
dynamic analyses at different excitation frequencies. The animations above show the
maximum principal stress in the rubber, and the velocity in the fluid at two excitation
frequencies, 10 Hz and 400 Hz (note that the animations are shown at the same speed).
The stiffness of the hydromount for a wider range of
frequencies (up to 1000 Hz) is shown in Figure 2.

Figure 2 Stiffness of the hydromount

This solution, like others presented in our earlier News and our
Fluid-Structure Interaction
web page,
illustrates the wide range of fluid-structure interaction problems that can be solved with the ADINA System.